Stropping device



May 14, A1935. s. HfDRAKE STROPPING' DEVICE Filed March 11, 1953 (Ittornega Patented May 14, 1935 l tof-Vimnrovemeatsin 'eraser blade; stroppinedee oisr'the "type which performs thestroppine opera# ltion by recvmcation-oi the :device .along e strop.. .Animnmbant object of the inventinngisto m'ovide anriimpmed. 'strominerdeice-.ot this tynedekSigned to facilitate its application-to andren-1on1.

nomia strop; :andato 'provide such ai.device-de-y signedtoimpmveliisnperation. v,

1 other lobiectsof-vcthe invention "will appear hereme; aanvopposftve smevew, of meupgr 905151,; of the device; 1 l. e

yam ionlgimdmaiseetion ontne une; Fig. 'i 4, showing ythe?, 'cleviee operatively engqged ywithstrop;

I Rendena viewer tiiedwice;`v

. #Figpv a view' simmer to Fig. 6,V ehowmg'the leekingjcamjof the@ blade holder shiftedto-blad "releasf 'mggaasectio on the une @-4 of Fig; 5,# and fjFlg'gQ aisection onthe line Q Sof'FIg; 1531100?-VY ing` the handle partly renden/er1from` thel loeiclyoi the device.

f "The boclylofV the strapping, deviceJ inol'udesa;

frame comprising oppositejlongitudinal side'memfl bers intheform of. flaty sheet metal plates." I and 2, andtransverse parallel' spacing v3 "extend-4 f ing between said side plates'and hcyld'ngA them 1in' parallell relation.. vSaid rods. have reduced 'ends inserted through apertures inthe side platesA near;

the ends ofV the latter, and upset. tolrivettherods tothe mates and, lform astiif framestructurej frame. `structure supports; theqstroppmg, 'meelhanism, rigid handle 4 'depends from the center of the frameeand disposed on., a line jat" a.k right @anglenr sihstantiallvV so to-Lthe. linneo; thel iframel Between said,.handle vand thel ,fra'xrflel there is' a; joint designed arranged with. re1a,` tioilfto'the. deveeu to dene vafside] entrance nablitigjthe'devlce to bey conveniently applied to and lretrieve Strepyeneeeineshafts 5. `rauh of said-shafts .is f emeed'beneathaonefof the frame rods iandhas reduced ends rotatably tted in bearing aventures, in the side plates-of the frame. izMidwytbetween Ihewshaftsl` 1i fthereeis another transverseshaft.

blndeiinthe holder.' 4:The rear'e'dgeoffthe rockf 'plane-thereon, 'lhiwheflz als); hesireduced ends roiitablyxiited: iin e. inf the side plaiss .Mounted on the mail; iSvBhOlderor clamp vforl sa' safety-.razon Between;eachJoffthek ,6i

drummen:mmal-melmexcemrm 7c', l therezis mdxhzinleeonnectinn ltovz'ock: the blade; holder asthe devinessA-recinroeated erlangenstrolp` I and bringm'gsupportedtbladerintozstroppingcongv l tanzt:v with f the strop.V "at, oppositey sidesij'o' prinsessen-tm `at'mefautes;fece-*e1 mesme, p

1&1; menemismo hroughpairiof meemnginter media@ gem@ amply-manned headed theisheitiandfthejfrwardi@igneogthe helden The'plateif! is] roltrablenpon said `rivets and the' portionsforjthe plates;v forward "of 'the' rivets' fernen@ gmspingl Jewsgf-'Jeompressibl spgcmgwesnersfljsurrotrnd the rivets luetwemv L th? Plates oontact of a supportedl blade 'with lthe rivets; Ner-thel' iorvvard; edges thejplatesihavvefpertui-es IG'to registerrwith'ape 735::

inthfgbldd, and'fdirectly at. its forward-y edg each pvlaitle'hasial ciilfal noilhfl'l also 'Serving as 'a `guidato' assist improperly tpositionir'igf,y thel 'nointisemmually eperebleam memberhv; v

ing a. cam edge 2 I engageablewithlthe rear-margin time plete 'zutefmclskthepleteII feleld' v grippingposition.: Thefcammember Vhasan vop-u 4?; j

theblatef ljand' lmitthefblede gripping throw ofjmecarn;fsaidjnnge Vmais a. knurl'edr'upperA surface;` The' oppositeedgeof the cam-armjhas] a "rearwardly lient ngej'uengageablef by the4 ehmnbfte farce thefegmto release position; -V The n cam 4edge hast'portionsegageablegwith Ithe margin ofpla'tef rII t to releasablyflretein vthe cam' venient for insertion and removal of the blade.. 'Ihe side plate v2 of the frame has upon itsouter face two Vertical parallel guides formed by slitting the plate and pressing out the portions thereof between the slits. Disposed between said guides in a position directlybeneatl the gear 8 is a locking slide 26 formed of a sheet metal vstamping and having straight edges in engagement with the guides.

side plate '2 and retaining the slide'between the guides. At its upper edge the slideihas'a locking tooth 29 engageable Vbetween adjacentteeth `of Y the gear 8 to lock-the shaft-'6' and hold the blade' holder Vin a tilted position most convenientv for insertion or removal ofthe blade.` At its lowerv edgethe slide hasan outturned manipulating tab: 30 to shift fitto lockingand unlocking positions;v Av spring washer 3| interposed vbetween the slide, and the outerhead of the retaining rivetffric-; tionally resistsaccidentaltshifting ofthe slide-. Thestrop engaging shafts V5 arewidely'ispaced;

apart beyond-the reach of a lblade -in-:the .holder and in addition to rocking the blade holder they' serve to guide'ortrainthe strop in afplane and; keep it ata proper denite angular stroppingre.- f blade.4 Just before,. the. 'i rocked blade reaches said fiat trained portion of l the stropits final movement is resisted by a cushlation to the supported ioning and reversing means.- This means includes a small lever 32 pivoted at the outerface 4of the frame plate. I upontaI ,rivet 33 secured tosaid plate. Saidleveris preferably Aformed ofla sheet: metal stamping and it hasinturnedlugs 34. dis-.

posed at opposite sides of its pivot. vThese lugs project through apertures in the frame plate and' into thepath of the rockin'gblade holder. The

' lever has a tail portionto which is'lconnectedV a tension spring 35 anchored to the frameplate. A portion 36 of said plate is pressedoutward between parallel slits and forms'a/housing *for` thel spring. The-spring normally holds the lever in a neutral position. Near each limitof its yrocking* movement the blade holder engages one of the lugs 34 and, rocks the vlever slightly to vincrease the tension of the spring.` When thev movement of the device along the strop is reversed the tensioned spring acts immediately torock the lever and cause it to automatically elevate theedge of the razor blade the strop. 0 Y .Y

The handle 3'of-the Vdevice is formed of'two sheet metal stampings '31jliaving flat face portions of similar contour and having inturned con-' tour flanges 38 disposed'in. edge vto edge abutment. Rivets 3941k secure together saidstampings orsections of the handle. Saidfrivets are enlarged betweenthe handle sections.` Between the handleand theframe there is a releasable joint.r

permitting detachment of the lhandle' from the body of the device for compactpacking.. .As prey f vlously mentioned this joint also designed t0 lateral branch opening through said edge. section ofthe handle is integrally formed with a flat right angular flange 44 to bear against the The slide vhasA a vertical slot 21- through'which projects a rivet 287secured tothe? fromlthe strop to avoidcutting permit transverse entry of the strop to the stropping mechanism.

Forjoining the handle to the frame, the side plate 2 has a depending integral portion 40 located midway between the ends of the plate and turned laterally inward to form a flat fiange 4|. Said flange extends to a point approximately midway between the side plates and it is disposed in a plane parallel to the plane of the strop engaging shafts 5 and spaced belowv the lower edge of the side platel Adjacent the side plate 2 .the flange bears two xed headed studs 42 spaced along a fore-and-aft line. At its free irmer edge the flange is formed with a bayonet slot 43 having a One upper face-'ofthe frame flange 4|. At its outer edge .the flange 44 has notches 45 to receive the studs 42 and, at the handle, said flange has a headedlocking pin mounted-to slide in a foreand-aftlslot '41 in -the flange. A spring washer 48 interposed between theupper head of said pin and the flange'frictionally resistsfsliding of the pin and serves to hold it in locking and unlocking positions. The handle is yattached by sliding the flange 44 laterally onto the flange 4| ,until the notches receive the studs l42 and they shankV of the locking pin-enters thebayonet slot. The slotf4`| is'then` positioned in register with the fore-and-aft branch ofthe bayonet slot and the locking pinisslid .therealong to rigidly lock the handle in place. The handle is readily releasable upon mere retraction of the frictionally held pin along the bayonet slot. :t

Thedevice is designed throughout for easy and eflicient operation. Its open `side enables it to be readily hooked' over a strop transversely of the latter and avoids Vthe, necessity of threading the strop en dwisethrough the device.- A thick substantial strop having both a leathery ply and a fabricrply, as indicated atS in Fig. 3, may be employed and the device may be readily changed from one side of the strop to they other without releasing the hand from the device. ABoth sides of the strop are thus rendered available without inconvenience or delay.v In using the device the handleisfpulleddownward to engage the widelyj 'spaced end shafts or rollers 5 with the Ystropand straighten.` the active portion of the strop between the rollers. kBy keeping said shafts pressed down against the strop the latter is maintained in proper yangular relation to the'blade. Even if only one shaft contacts the strop however `the blade holder willstill be positively rocked since.

each shaft has a driving connection with the blade holder. The lever 32 and Vspring 35 normally prevent the' blade from dropping down to the strop'pingline and thus avoid ycutting of the strop whenthe'device is applied. 'As previously pointed out, said lever and vspring also prevent cutting ofthe stropupon reversal of thev device. The design ofthe device also enables the blade to be conveniently inserted and removed without'releasing the ldevice from the hand. The locking slide v26 may be readily shifted by the thumbof the'fhand whichgrasps the handle, to lock the blade holder in a convenient position.l Then the thumb may be readily inserted upward through the clearance affordedl between the handle joint and the frame, to engage the flange 24 of thecaml 20 and operate the cam for clamping or releasing the blade.

What I claimis: l l

l.: A blade stropping device to reciprocate along a strop, comprising a frame; a blade holderpivotthereon, a locking pin borne -by said handle flange V ally supported 'by the frame to rock a supported Vblade into engagement with the strop at opposite sides of the pivot axis of the holder; driving means engageable. with .the strop and operatively connected tothe blade holder to rock the latter yas the device is reciprocated along .the strop; and means independent of said driving means to automatically rock the blade away from the strop upon reversal of movement of the device along the strop and comprising alever pivotally supported intermediate its ends by the frame and having portions at opposite sides-of its pivot engageable by tle blade holder near the limits of its rocking movement. toward the strop to rock said lever,.and aspring to yieldably-resist rocking of the lever'.

2. A blade stropping device to reciprocate along astrop, comprising a frame; a blade holder pivotally supported by the frame tol engage a supported blade with the strop at opposite sides of the pivot axis of the holder; a handle for reciprocating the device; and a manually releasable joint between said handle and 'frame comprising' a flange on the frame having a bayonet slot with a branch thereof opening'through one edge of the ilange, said flange having studs spaced inward Ifrom said edge,'a flange on the handle to abut said frame flange and having'notches at one edge to engage said studs and position the handle flange on the frame ilange, a locking pin borne by said handle flange to enter said-branch of the bayonet slot and mounted to slide into locking engagement with the other branch of the `bayonet slot to lock the flanges together, and frictional means to yieldably resist sliding of saidpin and hold it in locking position. o

3. A blade stropping device to reciprocate along a strop, comprising a frame; a blade holder pivotally supported by said frame to rock a supported blade into engagement with the strop; an element rotatably supported by the frame and engageable with the strop for rotation thereby as the stropping device is reciprocated; a gear Wheel driving connection between said rotatable element and the blade holder to rock the latter; a manually loperable locking slide mounted on the frame and engageable with said driving connection between gear teeththereof to releasably lock the blade holder' against rotation and hold it in a position for convenient insertion or removal of the blade; means to yieldably resist shifting of said locking slide to hold it in locking andunlocking positions; and means on the frame to guide the shift of the locking slide. l

e. A blade strcpping device to reciprocate along a strop, comprising a frame; a blade holder pivotally supported by the frame to engage a supported blade with the strop at opposite sides of the pivot axis of the holder; a handle for reciprocating the device; and a manually releasable joint between said handle and frame comprising a ilange on the frame having a bayonetv slot with a branch thereof opening through one edge of the ilangaa ilangey on the handle to abut said frame flange and slide to entersaid branch of vthefbayonet slot and '1 ing 'of said pin and hold it i'n locking position, and retaining means on one of said flanges for edgewise slidingreception of the other flange andY r` locatedv forVV retaining engagement therewith at points materiallyl spaced apart and materiallyr spaced from the bayonet slot'to prevent wobbling Y and lateral shift of one ange on theother.

5. In a blade` strapping device to reciprocate along a strop' and including a frame and anblade holder pivotally supported by said Vframe to rock a supported blade into engagement `with'a strop;

a pair o f strop guiding elements rotatablyr supported by the frame atoppositesid'es offtheblade holder; driving means operatively connecting said strop guiding elements to the blade holder to rock the latter and including a central gear ilxedto the blade holder, and gear rtrains at opposite sides o f the central gear operatively connecting said r str/op guiding 'elements thereto; a manually operable locking slide mounted on the frame and engageable with said central gear between gear teeth thereof to releasably lock the blade holderagainst rotation; means to yieldably resist shifting of said locking slide to hold it in locking and unlocking positions; and guide means on the frame to guide the shift of the locking slide.

6. A blade stropping device adapted to'receive a strop `and be reciprocated therealong comprisv in'g a body including a frame, a blade holder rockably borne Vby said frame to swing a supported blade into engagement with the upper face of a strop, and strop guiding means borne by the frame to engage the upper face of the stropr to flatten .f l the strop into a stropping plane beneath the blade holder; a substantially rigid handle depending vertically from the center of said body ofthe device; and a substantially rigid connection between said handle and one side only of said body and comprising an'inwardly exten'dinglateral ilange carried by theframeand spaced directly beneathkv said body, a flange on theupper endof theV handle to abut said frame llange and slide thereonf one-of said flanges -having a bayonet slot vwith a branch opening throughy one edge Aof the ilange and the other ilange having a locking pin to enter ksaid branch ofthe bayonet slot and mounted lto slide into Vlocking engagement with. the other branch of the slot to lock the flanges together, and

` retaining means on one of said flanges for edgewise sliding` reception of the other flangeand located forretaining engagement therewith* at points materially spaced apart and materially spaced from the bayonet slot to prevent Wobbling and lateral shift of one flange on vthe other, the

body of the device and said handle connection forming a side mouthfor transve strop to the strop'guiding means.

rse entry of the SAMUELHDRAKE. "65 

